one problem that i have is that since i rejetted and my open hillbilly filters have is that when i drive at higher speeds ,120 kmh, im running the carb dry, so i guess i have to pull them and adjust the float level to compensate the higher gas useage. before i rejeted,(i drilled out a pair of original jets that i had laying around and got lucky the plugs are nice and tan in colour and the bike pulls well , the bike would do about 135 kmh with a 27 hph cam. the german xs 400 were sold here with that cam. im lookin for the bigger cam from the states to raise the hp a little. i dont know how much of a difference it would make though.